Effects of WC on microstructure and corrosion resistance of directional structure Ni60 coatings
| Autor: | Heng-Li Wei, Xiu-Qian Li, Qiang-Bin Yang, Xiao-Tian Yang, Wensheng Li, Xiao-Yue Fu |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Alloy 02 engineering and technology Surfaces and Interfaces General Chemistry engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Electrochemistry 01 natural sciences Surfaces Coatings and Films Corrosion Composite coating Coating 0103 physical sciences Materials Chemistry engineering Pitting corrosion Grain boundary Composite material 0210 nano-technology |
| Zdroj: | Surface and Coatings Technology. 385:125359 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2020.125359 |
| Popis: | To enhance the corrosion resistance of directional structure coating of Ni60 alloy, the directional structure composite coating of Ni60 alloy reinforced with WC was prepared on the S45C steel by the induction remelting and forced cooling method. The immersion corrosion behaviors of coatings in 10% H2SO4 solution for 168 h and its electrochemical corrosions were investigated to analyze its corrosion resistance. The results showed that WC changed the grain boundary density and grain boundary type, having important effect on corrosion resistance and corrosion mechanism of directional structure Ni60 coating. The corrosion potentials of directional structure Ni60 coating and Ni60/WC coating is −0.395 and −0.112 V, respectively. The corrosion resistance of directional structure Ni60/WC coating is better than that of the coating without WC. The corrosion mechanism of directional structure Ni60/WC coating is slight intracrystalline corrosion, while the coating without WC is the pitting corrosion and the microgalvance corrosion. |
| Databáze: | OpenAIRE |
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